Correctly fill in the missing elements of the Sudoku board to find the unique solution.

SUDOKU PROCESS

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Click on an empty square of the Sudoku board to select it.

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Once a square is selected, the left, right, up, and down arrow keys may be used to select a different square.

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Click on an element in the list or press a key from 1 to 9 to modify the value in the selected square.

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To clear a value in a square, repeat the value that is in the selected square or click the empty square in the element list.

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To mark a value as a 'guess', click on the selected square. Click again to unmark it.

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Click the 'Edit Pencil Marks' checkbox or right click on a square to toggle the edit mode. (Pencil mark editing allows the player to enter potential values for the square without committing to a value.)

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To clear a pencil mark value, repeat the value of the pencil mark in the selected square.

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Once the Sudoku puzzle is solved, the player's score is incremented.

SUDOKU CONSTRAINTS

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Every element must occur in each row exactly one time on the Sudoku board.

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Every element must occur in each column exactly one time on the Sudoku board.

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Every element must occur in each box exactly one time on the Sudoku board.